选A. saving
这句话是个并列句,谓语动词有两个,分别是is 和 takes,选择的填空应该是个非谓语动词.
判断非谓语动词,主要看它和它的逻辑主语的关系是主动还是被动,这里save 的逻辑主语是主句主语“it”,（it save time）, 是主动关系,因而用现在分词,表示主动.
这种长句子如何判断谓语动词?First,it is the faster means of transportation
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